wp_cache_set_last_changed( string $group ): string

8059function wp_cache_set_last_changed( $group ) {8060	$previous_time = wp_cache_get( 'last_changed', $group );8061 8062	$time = microtime();8063 8064	wp_cache_set( 'last_changed', $time, $group );8065 8066	/**8067	 * Fires after a cache group `last_changed` time is updated.8068	 * This may occur multiple times per page load and registered8069	 * actions must be performant.8070	 *8071	 * @since 6.3.08072	 *8073	 * @param string       $group         The cache group name.8074	 * @param string       $time          The new last changed time (msec sec).8075	 * @param string|false $previous_time The previous last changed time. False if not previously set.8076	 */8077	do_action( 'wp_cache_set_last_changed', $group, $time, $previous_time );8078 8079	return $time;8080}